/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.shengchang.hu.supervision.Utils;

import android.annotation.TargetApi;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.util.Log;

import java.util.List;


/**
 * Service for managing connection and data communication with a GATT server hosted on a
 * given Bluetooth LE device.
 */
public class BluetoothLeClass {
    private final static String TAG = BluetoothLeClass.class.getSimpleName();
    private final static String UUID_KEY_DATA = "0000ffe1-0000-1000-8000-00805f9b34fb";
    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    private String mBluetoothDeviceAddress;
    private BluetoothGatt mBluetoothGatt;
    
    
    BluetoothGattCharacteristic mGattCharacteristic;
   public boolean isConnect;
	public interface OnConnectListener {
		void onConnect(BluetoothGatt gatt);
	}
	public interface OnDisconnectListener {
		void onDisconnect(BluetoothGatt gatt);
	}
	public interface OnServiceDiscoverListener {
		void onServiceDiscover(BluetoothGatt gatt);
	}
	public interface OnDataAvailableListener {
		 void onCharacteristicRead(BluetoothGatt gatt,
                                   BluetoothGattCharacteristic characteristic,
                                   int status);
		 void onCharacteristicWrite(BluetoothGatt gatt,
                                    BluetoothGattCharacteristic characteristic);
	}
    
	private OnConnectListener mOnConnectListener;
	private OnDisconnectListener mOnDisconnectListener;
	private OnServiceDiscoverListener mOnServiceDiscoverListener;
	private OnDataAvailableListener mOnDataAvailableListener;
	private Context mContext;
	public void setOnConnectListener(OnConnectListener l){
		mOnConnectListener = l;
	}
	public void setOnDisconnectListener(OnDisconnectListener l){
		mOnDisconnectListener = l;
	}
	public void setOnServiceDiscoverListener(OnServiceDiscoverListener l){
		mOnServiceDiscoverListener = l;
	}
	public void setOnDataAvailableListener(OnDataAvailableListener l){
		mOnDataAvailableListener = l;
	}
	
	public BluetoothLeClass(Context c){
		mContext = c;
	}
	
    // Implements callback methods for GATT events that the app cares about.  For example,
    // connection change and services discovered.
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
        @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            if (newState == BluetoothProfile.STATE_CONNECTED) {
            	if(mOnConnectListener!=null)
            		mOnConnectListener.onConnect(gatt);
                Log.i(TAG, "Connected to GATT server.");
                // Attempts to discover services after successful connection.
                Log.i(TAG, "Attempting to start service discovery:" +
                        mBluetoothGatt.discoverServices());

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                if(mOnDisconnectListener!=null)
                	mOnDisconnectListener.onDisconnect(gatt);
                Log.i(TAG, "Disconnected from GATT server.");
            }
        }

        @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        	displayGattServices(getSupportedGattServices());
            if (status == BluetoothGatt.GATT_SUCCESS && mOnServiceDiscoverListener!=null) {
                	mOnServiceDiscoverListener.onServiceDiscover(gatt);
            } else {
                Log.w(TAG, "onServicesDiscovered received: " + status);
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status) {
        	if (mOnDataAvailableListener!=null)
        		mOnDataAvailableListener.onCharacteristicRead(gatt, characteristic, status);
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {
        	if (mOnDataAvailableListener!=null)
        		mOnDataAvailableListener.onCharacteristicWrite(gatt, characteristic);
        }
    };

    /**
     * Initializes a reference to the local Bluetooth adapter.
     *
     * @return Return true if the initialization is successful.
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public boolean initialize() {
        // For API level 18 and above, get a reference to BluetoothAdapter through
        // BluetoothManager.
        if (mBluetoothManager == null) {
            mBluetoothManager = (BluetoothManager) mContext.getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager == null) {
                Log.e(TAG, "Unable to initialize BluetoothManager.");
                return false;
            }
        }

        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
            return false;
        }

        return true;
    }

    /**
     * Connects to the GATT server hosted on the Bluetooth LE device.
     *
     * @param address The device address of the destination device.
     *
     * @return Return true if the connection is initiated successfully. The connection result
     *         is reported asynchronously through the
     *         {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     *         callback.
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public boolean connect(final String address) {
        if (mBluetoothAdapter == null || address == null) {
            Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
            return false;
        }

        // Previously connected device.  Try to reconnect.
        if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)
                && mBluetoothGatt != null) {
            Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
            return mBluetoothGatt.connect();
        }

        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
        if (device == null) {
            Log.w(TAG, "Device not found.  Unable to connect.");
            return false;
        }
        // We want to directly connect to the device, so we are setting the autoConnect
        // parameter to false.
        mBluetoothGatt = device.connectGatt(mContext, false, mGattCallback);
        Log.d(TAG, "Trying to create a new connection.");
        mBluetoothDeviceAddress = address;
        return true;
    }

    /**
     * Disconnects an existing connection or cancel a pending connection. The disconnection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public void disconnect() {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        isConnect=false;
        mBluetoothGatt.disconnect();
    }

    /**
     * After using a given BLE device, the app must call this method to ensure resources are
     * released properly.
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public void close() {
        if (mBluetoothGatt == null) {
            return;
        }
        mBluetoothGatt.close();
        mBluetoothGatt = null;
    }

    /**
     * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.readCharacteristic(characteristic);
    }

    /**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled If true, enable notification.  False otherwise.
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
    }

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public void writeCharacteristic(BluetoothGattCharacteristic characteristic){
    	 mBluetoothGatt.writeCharacteristic(characteristic);
    }
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public void write(String s)
    {
    	mGattCharacteristic.setValue(s);
    	mBluetoothGatt.writeCharacteristic(mGattCharacteristic);
    }
    /**
     * Retrieves a list of supported GATT services on the connected device. This should be
     * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
     *
     * @return A {@code List} of supported services.
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    public List<BluetoothGattService> getSupportedGattServices() {
        if (mBluetoothGatt == null) return null;

        return mBluetoothGatt.getServices();
    }
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
    private void displayGattServices(List<BluetoothGattService> gattServices) {
        if (gattServices == null) return;

        for (BluetoothGattService gattService : gattServices) {
        	//-----Service-----//
        	/*int type = gattService.getType();
            Log.e(TAG,"-->service type:"+Utils.getServiceType(type));
            Log.e(TAG,"-->includedServices size:"+gattService.getIncludedServices().size());
            Log.e(TAG,"-->service uuid:"+gattService.getUuid());
            */
            //-----Characteristics----//
            List<BluetoothGattCharacteristic> gattCharacteristics =gattService.getCharacteristics();
            for (final BluetoothGattCharacteristic gattCharacteristic: gattCharacteristics) {
               /* Log.e(TAG,"---->char uuid:"+gattCharacteristic.getUuid());
                
                int permission = gattCharacteristic.getPermissions();
                Log.e(TAG,"---->char permission:"+Utils.getCharPermission(permission));
                
                int property = gattCharacteristic.getProperties();
                Log.e(TAG,"---->char property:"+Utils.getCharPropertie(property));
				
                byte[] data = gattCharacteristic.getValue();
        		if (data != null && data.length > 0) {
        			Log.e(TAG,"---->char value:"+new String(data));
        		}
				*/
        		//UUID_KEY_DATA是可以跟蓝牙模块串口通信的Characteristic
        		if(gattCharacteristic.getUuid().toString().equals(UUID_KEY_DATA)){        			
        			setCharacteristicNotification(gattCharacteristic, true);
        			mGattCharacteristic=gattCharacteristic;
        			isConnect=true;
     
        		}
        		/*
        		//-----Descriptors-----//
				List<BluetoothGattDescriptor> gattDescriptors = gattCharacteristic.getDescriptors();
				for (BluetoothGattDescriptor gattDescriptor : gattDescriptors) {
					Log.e(TAG, "-------->desc uuid:" + gattDescriptor.getUuid());
					int descPermission = gattDescriptor.getPermissions();
					Log.e(TAG,"-------->desc permission:"+ Utils.getDescPermission(descPermission));
					
					byte[] desData = gattDescriptor.getValue();
					if (desData != null && desData.length > 0) {
						Log.e(TAG, "-------->desc value:"+ new String(desData));
					}
        		 }*/
            }
        }//

    }
  
}
